4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 131 · 40 questions

The fast method (Split and join): Split each 4-digit number into two 2-digit halves: 4768 → 47|68. Work out the left halves and the right halves on their own. Adding: a right half of 100 or more carries 1 to the left half. Subtracting: right half too small? Borrow 1 from the left half — it is worth 100 on the right.

1. 1.6305 − 2008 =
2. 2.3110 + 3024 =
3. 3.2205 + 1195 =
4. 4.2379 − 1320 =
5. 5.4953 + 7930 =
6. 6.5450 − 3892 =
7. 7.6815 + 4841 =
8. 8.7001 + 6988 =
9. 9.2255 + 6680 =
10. 10.6411 + 4950 =
11. 11.2528 + 8204 =
12. 12.5943 − 3476 =
13. 13.6459 + 6058 =
14. 14.6731 + 5745 =
15. 15.4760 − 2182 =
16. 16.3513 + 1439 =
17. 17.6859 − 2498 =
18. 18.8782 − 5725 =
19. 19.2424 + 1535 =
20. 20.2462 + 8079 =
21. 21.5918 + 2518 =
22. 22.3973 − 2272 =
23. 23.6853 + 4247 =
24. 24.7667 + 7633 =
25. 25.8904 − 2312 =
26. 26.8204 + 5850 =
27. 27.3002 + 3989 =
28. 28.5586 − 4127 =
29. 29.7462 − 5922 =
30. 30.2887 + 4494 =
31. 31.1236 + 4501 =
32. 32.7516 − 6637 =
33. 33.2727 + 5103 =
34. 34.2305 + 6310 =
35. 35.8478 − 2363 =
36. 36.1787 + 8270 =
37. 37.7211 + 8739 =
38. 38.2165 + 5183 =
39. 39.4128 − 1526 =
40. 40.8450 − 6176 =

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